组件重用技术在企业级GIS系统构建中的应用研究

回顾了软件重用技术的发展过程,分析了基于组件的重用模型的特点,在此基础上以城市配电网GIS系统中实时数据显示组件的实现（借助ESRI公司的组件式GIS软件－MapObjects）为例,对企业级GIS系统构建过程中组件重用技术的运用进行了论述和尝试。     

组件式GIS开发的实践

虽然GIS软件在努力地追赶IT主流技术的发展，取得了许多有意义的进展，但相当一部分现代软件技术至今没有在GIS软件实现中得到有效的使用。GIS发展至今，虽然已经存在各种类型的GIS平台和应用软件，但要像搭积木一样组装成满足自己需求的GIS应用软件及实现各种GIS系统之间的集成仍然很困难。采用组件式软件方法开发组件式软件GIS是一种解决思路。详述了GIS开发的历史、组件技术、组件式GIS开发的基本原则及组件式GIS的缺点。     

VC环境下两种GIS组件开发比较

组件式地理信息系统是目前GIS软件技术发展的主流.分析了Maplnfo公司推出的MapX组件和美国环境系统研究所推出的MapObjects组件的特点和功能,介绍了在Visual C 环境下开发二者的差异,探讨了在控件初始化,图层操作、动态目标实时跟踪,通用地图工具等具体功能实现上的差别,并给出了实例说明.最后,总结了MapX与MapObjects各自的开发优势和缺陷.     

基于组件技术的张掖电子地图设计实现及关键技术研究

组件技术是当今软件技术发展的潮流,在地理信息系统(GIS)的应用领域也是如此。通过构建张掖电子地图的实例,介绍使用GIS开发组件MapObjects进行GIS应用开发的方法和高分辨率遥感影像在其中的应用,以及系统功能扩展中涉及的一些关键技术。结果表明,借助组件技术不仅可以快速建立功能完善的GIS应用系统,还能在此基础上方便地进行功能扩展。     

基于组件技术的地理信息系统应用研究

组件式地理信息系统是适应软件组件化潮流的新一代地理信息系统,本文阐述了基于ActiveX的GIS组件技术和MapObjects控件的运行机制,并介绍了基于组件技术的应用实例。     

组件式GIS系统的设计

组件式GIS系统是适应软件组件化潮流的新一代地理信息系统。本文基于组件技术和GIS技术．提出了一种组件式GIS系统的设计方案，并重点介绍了组件式GIS系统的核心一组件仓库的详细设计方法。     

基于MapX的卫星侦察态势显示系统的设计与实现

GIS软件技术正向着组件式和WebGIS方向发展，本文简要介绍了一种GIS组件(即MapX)，列举了用MapX和高级语言VB来开发卫星侦察态势显示GIS的实例，并给出了该系统的功能及其实现过程。     

基于MapObjects的GIS在公交查询系统中的应用研究

从公交信息管理现状出发,对如何利用GIS组件MapObjects开发公交查询系统进行了研究,针对传统换乘算法不能满足公交查询系统需要的现状,重点阐述了基于换乘次数最少的最优路径改进算法的基本思想.系统选用MapObjects作为GIS二次开发组件,通用语言C#作为开发语言,数据库采用SQLServer2000,实现了GIS软件的基本功能以及公交信息查询功能.     

基于MapObjects的组件式GIS技术应用研究

组件式地理信息系统已成为GIS技术发展的新趋势.本文阐述了组件式地理信息系统的技术基础和基本功能特点,并结合实例介绍了以PB为开发平台,基于MapObjects的组件式GIS开发的基本步骤和主要功能的实现方法.     

基于.NET平台和C#语言的MapObjects二次开发

阐述了微软的．NET平台以及C#语言的特点、优势,介绍了组件式GIS的概念、特点以及ESRI公司MapObjects组件的功能。在此基础上,分析了使用不同语言和开发工具对MapObjects进行开发的优缺点。最后举例说明了在．NET环境下如何使用C#语言对MapObjects进行二次开发。     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

法律信息库系统

本文分析了法律数据库的结构和特点，介绍了采用面向对象设计方法和超文本数据库技术开发和实现法律信息库系统将作为重要网络资源之一为不同用户进行法律咨询服务。     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

International Journal of Automation and Computing Table of Contents

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Information for authors

正SCIENCE CHINA Information Sciences(Sci China Inf Sci),cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press,is committed to publishing highquality,original results of both basic and applied research in all areas of information sciences,including computer science and technology;systems science,control science and engineering(published in Issues with odd numbers);information and communication engineering;electronic science and technology(published in Issues with even numbers).Sci China Inf Sci is published monthly in both print and electronic forms.It is indexed by Academic OneFile,Astrophysics Data System(ADS),CSA,Cabells,Current Contents/Engineering,Computing and Technology,DBLP,Digital Mathematics Registry,Earthquake Engineering Abstracts,Engineering Index,Engineered Materials Abstracts,Gale,Google,INSPEC,Journal Citation Reports/Science Edition,Mathematical Reviews,OCLC,ProQuest,SCOPUS,Science Citation Index Expanded,Summon by Serial Solutions,VINITI,Zentralblatt MATH.     

Erratum to: Fast global kernel fuzzy c-means clustering algorithm for consonant/vowel segmentation of speech signal

正Erratum to:J Zhejiang Univ-Sci C(ComputElectron)2014 15(7):551-563doi:10.1631/jzus.C1300320The original version of this article unfortunately contained mistakes.Algorithm 6 should be as follows:Algorithm 6 FGKFCM-F clustering Input:(1)X={x_1,x_2,…,x_N},,x_iR~d,i=1,2,…,N,the dataset;(2)C,1C≤N,the number of clusters;(3)ε0,the stopping criterion;     

Journal of Zhejiang University-SCIENCE C (Computers & Electronics) Total contents

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A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.